(2)__Any bridge, culvert, overpass or underpass closed by the Commissioner of Transportation must be posted by appropriate notices.

B.__The following penalties apply to violations of this subsection.

(1)__A person who violates this subsection commits a civil violation for which a fine of not less than $100 nor more than $500 may be adjudged.

(2)__A person who violates this subsection after having been adjudicated as having committed 3 or more civil violations under this Part within the previous 5-year period commits a Class E crime.

9.__Reckless operation of snowmobile.__A person may not operate a snowmobile in such a way as to recklessly create a substantial risk of serious bodily injury to another person.__ Violation of this subsection is a Class D crime.

10.__Operating snowmobile to endanger.__A person may not operate a snowmobile so as to endanger any person or property by:

A.__Operating the snowmobile except at a reasonable and prudent speed for the existing conditions, including when approaching and crossing an intersection or railway grade crossing, when approaching and taking a curve, when approaching a hill crest, when traveling upon any narrow or winding trail and when a special hazard exists with respect to pedestrians, skiers or other traffic by reason of weather or trail conditions; or

B.__Operating the snowmobile in a manner that fails to control its speed at all times as necessary to avoid colliding with any person, vehicle, snowmobile or other object on or adjacent to the snowmobile trail.

A person who violates this subsection commits a Class E crime.

11.__Operating snowmobile at greater than reasonable and prudent speed.__A person may not operate a snowmobile except at a reasonable and prudent speed for the existing conditions.